Abstract: An aspect of the present invention relates to a high-strength and high-manganese steel having excellent low-temperature toughness, the high-strength and high-manganese steel comprising, in terms of wt %, 4.3-5.7% of manganese (Mn), 0.015-0.055% of carbon (C), 0.015-0.05% silicon (Si), 0.6-1.7% of aluminum (Al), 0.01-0.1% of niobium (Nb), 0.015-0.055% of titanium (Ti), 0.001-0.005% of boron (B), 0.03% or less of phosphor (P), 0.02% or less of sulfur (S), and the balance iron (Fe) and other inevitable impurities, wherein the microstructure thereof comprises, in terms of percent by volume, 40-60% of martensite and 40-60% of tempered martensite.
Abstract: Provided is a roller assembly which includes: a supporter configured to rotatably support a roller disposed in a movement path of a to-be-treated material; a fixed shaft attached to a rear surface of the supporter and having at least a stretchable portion; a body attached to the rear surface side of the supporter so as to surround the fixed shaft; and a plunger attached so as to connect the body and the fixed shaft and formed so that at least a portion thereof advances and retreats with respect to the movement path, a casting device provided with the roller assembly, and a roller separating method, wherein the roller assembly is capable of separating the roller from the movement path during emergency.
Type:
Grant
Filed:
August 8, 2018
Date of Patent:
October 12, 2021
Assignee:
POSCO
Inventors:
Kyung Shik Oh, Young Hoon Kang, Joo Dong Lee, Ki Hwan Joung
Abstract: Provided is a steel for pipes for use in applications such as oil or gas extraction. Particularly, there are provided a steel for pipes having high fatigue resistance, a method of manufacturing the steel, and a welded steel pipe obtained using the steel.
Type:
Grant
Filed:
September 11, 2017
Date of Patent:
October 12, 2021
Assignee:
POSCO
Inventors:
Kyung Min Noh, Min Sung Joo, Ki Seok Kim, Young Hune Kim
Abstract: Provided is a steel sheet for a hot press formed member having excellent painting adhesion and post-painting corrosion resistance, and a method for manufacturing the same. A steel sheet for hot press forming according to one aspect of the present invention comprises a base steel sheet and a plated layer formed on a surface of the base steel sheet, wherein the ratio of an area occupied by pores to the entire area of a surface layer portion may be 10% or more in a cross section of the surface layer portion observed when the plated layer is cut in a thickness direction thereof.
Type:
Grant
Filed:
May 31, 2018
Date of Patent:
October 12, 2021
Assignee:
POSCO
Inventors:
Jin-Keun Oh, Seong-Woo Kim, Hyeon-Jeong Shin, A-Ra Cho
Abstract: A Ti, Nb-added ferritic stainless steel with excellent low-temperature toughness of weld zone according to an embodiment of present disclosure includes, in percent (%) by weight of the entire composition, C: 0.004 to 0.015%, N: 0.004 to 0.015%, Si: 0.01 to 0.7%, Mn: 0.01 to 0.7%, P: 0.0001 to 0.04%, S: 0.0001 to 0.005%, Cr: 10 to 30%, Al: 0.005 to 0.04%, Ti: 0.1 to 0.5%, Nb: 0.1 to 0.6%, Ca: 0.0001 to 0.003%, the remainder of iron (Fe) and other inevitable impurities, satisfies the following equation (1), and Al—Ca—Ti—Mg—O-based oxide and Ti—Nb—C—N carbonitride containing the oxide have an average diameter of 3 to 10 ?m and a distribution density of 4/mm2 or more. {(Ti+0.5*Nb)*(C+N)}/Al>0.
Type:
Application
Filed:
November 2, 2018
Publication date:
October 7, 2021
Applicant:
POSCO
Inventors:
Jong Chul Kim, Wan-Yi Kim, Il Chan Jung, Jin-Suk Kim, Deok Chan Ahn
Abstract: Disclosed are a steel wire rod having excellent low temperature impact toughness and a manufacturing method therefor. The steel wire rod having excellent low temperature impact toughness according to an embodiment of the present invention contains, by weight %, carbon (C): 0.40-0.90%, silicon (Si): 0.5-1.0%, manganese (Mn): 11-25%, copper (Cu): 1.0-3.0%, phosphorus (P): 0.020% or less, sulfur (S): 0.020% or less, aluminum (Al): 0.010-0.050%, nitrogen (N): 0.0010-0.0050%, and the remainder being Fe and unavoidable impurities. The steel wire rod has a microstructure which contains an austenite phase having an area fraction of 95% or more, and a volume fraction of a deformation twin formed in an austenite grain is 1-8%. Therefore, it is possible to provide a steel wire rod having excellent low temperature impact toughness used in industrial machines or automobile parts, etc.
Abstract: Provided is a Zn—Mg alloy plated steel material comprising: a base steel material; and first to third Zn—Mg alloy layers sequentially formed on the base steel material, wherein the first to third Zn—Mg alloy layers have a Zn single phase, a Mg single phase, a MgZn2 alloy phase, and a Mg2Zn11 alloy phase, an area rate of the MgZn2 alloy phase included in the first to third Zn—Mg alloy layers is larger than an area rate of the Mg2Zn11 alloy phase included in the first to third Zn—Mg alloy layers, and an area rate of a MgZn2 alloy phase included in each of the first to third Zn—Mg alloy layers is larger than an area rate of a MgZn2 alloy phase included in the second Zn—Mg alloy layer.
Type:
Grant
Filed:
December 22, 2017
Date of Patent:
October 5, 2021
Assignee:
POSCO
Inventors:
Seok-Jun Hong, Young-Do Kim, Woo-Sung Jung, Hyun-Woo Kim, Jong-Min Byun, Su-Ryong Bang, Tae-Yeob Kim
Abstract: The present invention relates to a steel material for pressure vessels, offshore structures and the like and, more specifically, to a high-strength steel material having excellent low-temperature strain aging impact properties and a method for manufacturing same.
Abstract: Provided is a manufacturing method of a surface-treated Zn—Ni alloy electroplated steel sheet, the method comprising the steps of: preparing a Zn—Ni alloy electroplated steel sheet including a steel sheet and a Zn—Ni alloy-plated layer with an Ni content of 5-20 wt % (S1); preparing an alkaline electrolyte solution in which 4-250 g/L of potassium hydroxide (KOH) or sodium hydroxide (NaOH) or both combined are added in distilled water (S2); and inside the alkaline electrolyte solution, placing the Zn—Ni alloy electroplated steel sheet as an anode and installing another metal sheet as a cathode, and applying 2-10 V of an alternating or direct current to conductor electrochemical etching such that a 3-point average value of the arithmetic average roughness (Ra) of the surface of the Zn—Ni alloy electroplated steel sheet reaches 200-400 nm, thereby producing a surface-treated electroplated steel sheet (S3).
Abstract: A non-oriented electrical steel sheet according to an embodiment of the present invention, comprises: Si: 2.0 to 3.5%, Al: 0.05 to 2.0%, Mn: 0.05 to 2.0%, In: 0.0002 to 0.003% by wt % and Fe and inevitable impurities as the remainder.
Abstract: The present invention provides an apparatus and a method for detecting the presence of and/or determining the amount of a label-free microRNA using an atomic force microscope. The method is extremely selective and/or ultrasensitive. In particular, the present invention provides a cantilever comprising a probe that selectively binds to a double strand of DNA/RNA hybrid complex. The probe comprises a hybrid binding domain (HBD) or a variant thereof.
Type:
Grant
Filed:
January 22, 2017
Date of Patent:
September 7, 2021
Assignees:
POSCO, POSTECH ACADEMY-INDUSTRY FOUNDATION
Inventors:
Joon Won Park, Joung Hun Kim, Young Kyu Kim, Hyun Seo Koo, Yoon Hee Lee
Abstract: Provided is a cold-rolled steel sheet manufactured by a cold-rolled steel sheet manufacturing method comprising a continuous annealing step, which has a composition comprising, by weight %: C: 0.1-0.15%; Si: 0.2% or less (including 0%); Mn: 2.3-3.0%; P: 0.001-0.10%; S: 0.010% or less (including 0%); Sol.Al: 0.01-0.10%; N: 0.010% or less (excluding 0%); Cr: 0.3-0.9%; B: 0.0010-0.0030%; Ti: 0.01-0.03%; Nb:0.01-0.03%; the balance being Fe and other impurities, and satisfies following relationship 1. [relationship 1] 1650?5541.4C+239Mn+169.1Cr+0.74SS-1.36RCS?1688, in which microstructure comprises, in area %, at least 90% of martensite and tempered martensite; and 10% or less of ferrite and bainite, in which the fraction of the tempered martensite in the martensite and the tempered martensite is 90% or more, in area %, and the ratio (b/a) of the C+Mn concentration (a) in the martensite to the C+Mn concentration (b) in the ferrite and the bainite is 0.65 or more.
Abstract: An exemplary embodiment of the present invention relates to a magnesium alloy sheet and a manufacturing method thereof. According to an exemplary embodiment of the present invention, a magnesium alloy sheet including 1.0 to 10.5 wt % of Al, 0.1 to 2.0 wt % of Zn, 0.1 to 2.0 wt % of Ca, 0.03 to 1.0 wt % of Y, 0.002 to 0.02 wt % of Be, and a balance of Mg and inevitable impurities, with respect to a total of 100 wt % of the magnesium alloy sheet, may be provided.
Type:
Grant
Filed:
December 12, 2017
Date of Patent:
August 17, 2021
Assignee:
POSCO
Inventors:
Young-Wook Chae, Jun Ho Park, Jae Joong Kim, Oh-Duck Kwon
Abstract: Provided is a hot dip aluminized steel material including a base steel and a hot-dip Al—Si-coated layer, wherein the surface layer of the base steel is provided with an Al-enriched layer in which 2 wt % to 20 wt % of Al is solid-solubilized, and an interface between the base steel and the hot-dip Al—Si-coated layer has a double-layer structured interfacial alloy layer having different hardnesses.
Type:
Grant
Filed:
December 22, 2017
Date of Patent:
August 17, 2021
Assignee:
POSCO
Inventors:
Ki-Cheol Kang, Hyeon-Seok Hwang, Yon-Kyun Song, Il-Jeong Park
Abstract: Provided are a high-strength cold-rolled steel sheet and a hot-dip galvanized steel sheet comprising in % by weight: 0.05 to 0.3% of carbon (C); 0.6 to 2.5% of silicon (Si); 0.01 to 0.5% of aluminum (Al); 1.5 to 3.0% of manganese (Mn); and the remainder being Fe and unavoidable impurities, the steel sheet has a microstructure comprised of, in an area fraction, ferrite in an amount of 60% or less, lath-type bainite of 25% or more, martensite of 5% or more, and lath-type retained austenite in an amount of 5%, wherein the ferrite has an average grain diameter of 2 ?m or less and the ferrite satisfies Fn2, defined by relational expression 1, is 89% or more and Fa5, defined by relational expression 2, is 70% or less.
Type:
Grant
Filed:
December 20, 2016
Date of Patent:
August 17, 2021
Assignee:
POSCO
Inventors:
Jai-Hyun Kwak, Hang-Sik Cho, Dong-Seoug Sin
Abstract: Disclosed is a smart factory platform for processing data obtained in a continuous process including a first process and a second process following the first process. The smart factory platform includes a distributed parallel processing system including at least one processing unit that generates mapping data by mapping a process identification (ID) to collection data collected from the continuous process and sorts the mapping data to generate sorting data, the process ID defining a process where the collection data occurs and the sorting data being generated for association processing between pieces of collection data collected from different processes; and a big data analysis system storing the sorting data with respect to the process ID.
Type:
Grant
Filed:
August 31, 2017
Date of Patent:
August 3, 2021
Assignee:
POSCO ICT CO., LTD.
Inventors:
Won Mo Yang, Hyun Woo Yu, Eun Kgu Kim, Man Jin Park, Jang Soo Jung, Tong Ki Kim, Young Lea Lee, Seong Cheol Park, Sung Yong Lee, Kyung Ho Ku, Seung Hyun Seo, Nam Geon Yang, Woo Kyum Kim, Jin Woong Kang, Seo Yeon Hwang, In Lee
Abstract: Provided is a hot-dip galvanized steel sheet including a base steel sheet and a hot-dip zinc-based plating layer formed on the base steel sheet. The hot-dip zinc-based plating layer includes a Zn single phase having an average equivalent circular diameter of 120 ?m or less as a microstructure. In the Zn single phase, a Zn single phase having a crystal structure of which a {0001} plane is parallel to a surface of the steel sheet, is provided in an area fraction of 70% or less.
Abstract: To optimize equipment and processes to enhance magnetic domain refinement efficiency and to enhance workability to improve processing capability, a method of refining a magnetic domain of a grain-oriented electrical steel plate includes zigzag controlling for transferring the steel plate without being inclined in right and left directions along a production line center, steel plate support roll position adjusting for controlling a position of the steel plate in up and down directions while supporting the steel plate, laser beam irradiating for irradiating a laser beam to a surface of the steel plate to melt the steel plate to form a groove in the surface of the steel plate, and removing for absorbing and removing radiant heat due to reflection of the laser beam irradiated to the surface of the steel plate during the laser beam irradiating.
Type:
Grant
Filed:
December 26, 2016
Date of Patent:
July 27, 2021
Assignee:
POSCO
Inventors:
Seung Ho Lim, Do Ryun Lee, Jin Ho Kim, Myung Sik Chun, Gyoo Taek Lee, Seong Cheol Hong
Abstract: The present invention relates to a resin composition comprising 40% to 50% by weight of a polyester resin on the basis of a total of 100% by weight of the composition, the polyester resin comprising a main resin and an auxiliary resin, wherein the main resin has a higher molecular weight than the auxiliary resin, and the difference of a glass transition temperature between the main resin and the auxiliary resin is 25° C. or less.
Type:
Grant
Filed:
December 9, 2016
Date of Patent:
July 20, 2021
Assignee:
POSCO
Inventors:
Moon Jae Kwon, Kee Cheol Park, Choon Ho Kang
Abstract: By optimizing equipment and processing, magnetic domain miniaturization efficiency can be increased, workability can be improved, and processing ability can be increased through same. Provided is a method for miniaturizing the magnetic domains of a directional electric steel plate, the method comprising: a steel plate supporting roll position adjusting step of controlling the vertical direction position of a steel plate while supporting the steel plate progressing along a production line; and a laser emitting step of melting the steel plate by emitting a laser beam to form grooves on the surface of the steel plate and a removing steel plate surface step of to remove remaining spatters dropped on the surface of the steel plate after the laser emitting.
Type:
Grant
Filed:
January 18, 2017
Date of Patent:
July 20, 2021
Assignee:
POSCO
Inventors:
Seong Cheol Hong, Ki Young Min, Gyoo Taek Lee, Se min Park, Oh Yeoul Kwon, Jae Kyoum Kim